<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert show-icon title="注意: 只允许为第三级分类设置相关参数!" type="warning" :closable="false"></el-alert>
      <!-- 选中商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类: </span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            @click="addDialogVisible = true"
            size="mini"
            :disabled="isBtnDisabled"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  closable
                  :key="i"
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  @click="showEditDialog(scope.row.attr_id)"
                  icon="el-icon-edit"
                >编辑</el-button>
                <el-button
                  size="mini"
                  @click="removeParamsById(scope.row.attr_id)"
                  type="danger"
                  icon="el-icon-delete"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            @click="addDialogVisible = true"
            size="mini"
            :disabled="isBtnDisabled"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
              <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  closable
                  :key="i"
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  @click="showEditDialog(scope.row.attr_id)"
                  icon="el-icon-edit"
                >编辑</el-button>
                <el-button
                  size="mini"
                  @click="removeParamsById(scope.row.attr_id)"
                  type="danger"
                  icon="el-icon-delete"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类数据
      cateList: [],
      //   级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 级联选择框双向绑定的数组 id
      selectedCateKeys: [],
      //   被激活的页签的名称
      activeName: "many",
      //   动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      //   控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //   控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //   添加参数的表单数据对象
      addForm: {
        attr_name: ""
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      },
      //   修改的表单数据对象
      editForm: {}
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    getCateList() {
      this.$http.get("categories").then(res => {
        var res = res.data;
        if (res.meta.status !== 200) {
          return this.$message.error("获取商品分类数据失败");
        }
        this.cateList = res.data;
      });
    },
    // 级联选择框变化会触发
    handleChange() {
      this.getParamsData();
    },
    // tab 页签点击时触发
    handleTabClick() {
      this.getParamsData();
    },
    // 获取参数的列表数据
    getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      //   当前为三级分类
      //   根据所选中的类别id和面板,获取对应的参数
      this.$http
        .get(`categories/${this.cateId}/attributes`, {
          params: { sel: this.activeName }
        })
        .then(res => {
          var res = res.data;
          if (res.meta.status !== 200) {
            return this.$message.error("获取参数失败");
          }
          // 将字符串 attr_vals 以空格进行分割，并存入新的 attr_vals 数组中
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
            // 控制文本框中的显示与隐藏
            item.inputVisible = false;
            // 文本框中的值
            item.inputValue = "";
          });

          if (this.activeName === "many") {
            this.manyTableData = res.data;
          } else {
            this.onlyTableData = res.data;
          }
        });
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击确认添加参数按钮触发
    addParams() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) return;
        this.$http
          .post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          .then(res => {
            var res = res.data;
            if (res.meta.status !== 201) {
              return this.$message.error("添加参数失败");
            }
            this.$message.success("添加成功");
            this.addDialogVisible = false;
            this.getParamsData();
          });
      });
    },
    // 点击编辑按钮，展示修改的对话框
    showEditDialog(attr_id) {
      // 查询当前参数的信息
      this.$http
        .get(`categories/${this.cateId}/attributes/${attr_id}`, {
          params: { attr_sel: this.activeName }
        })
        .then(res => {
          var res = res.data;
          if (res.meta.status !== 200) {
            return this.$message.error("获取参数信息失败");
          }

          this.editForm = res.data;
        });
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(valid => {
        if (!valid) return;
        this.$http
          .put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            {
              attr_name: this.editForm.attr_name,
              attr_sel: this.activeName
            }
          )
          .then(res => {
            var res = res.data;
            if (res.meta.status !== 200) {
              return this.$message.error("更新参数信息失败");
            }
            this.$message.success("更新参数信息成功");
            this.editDialogVisible = false;
            this.getParamsData();
          });
      });
    },
    // 点击删除按钮删除参数信息
    removeParamsById(attr_id) {
      this.$confirm("此操作将永久删除此参数, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(res => {
          this.$http
            .delete(`categories/${this.cateId}/attributes/${attr_id}`)
            .then(res => {
              var res = res.data;
              if (res.meta.status !== 200) {
                return this.$message.error("删除失败");
              }
              this.$message.success("删除成功");
              this.getParamsData();
            });
        })
        .catch(err => {
          this.$message.error("取消删除");
        });
    },
    // 文本框失去焦点和按下enter都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputVisible = false;
        row.inputValue = "";
        return;
      }
      // 如果没有return 则证明数据合法，需要进行后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputVisible = false;
      row.inputValue = "";
      this.saveAttrVals(row);
    },
    // 将对 attr_vals 的操作保存到数据库
    saveAttrVals(row) {
      this.$http
        .put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" ")
        })
        .then(res => {
          var res = res.data;
          if (res.meta.status !== 200) {
            return this.$message.error("修改参数项失败");
          }
          this.$message.success("修改参数项成功");
        });
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      //   $nextTick 当页面上的元素被重新渲染之后执行
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    }
  },
  computed: {
    //   如果按钮需要被禁用,则返回true
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    }
  }
};
</script>

<style lang="scss" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>